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r � <br /> t <br /> URS <br /> Ms.Natalia Subbotnikova <br /> San Joaquin County Environmental Health Department <br /> December 1,2011 Page 3 of 4 <br /> The flush-mounted well cover and concrete pad will be removed.As discussed with you on <br /> November 4,2011,each well will be pressure-grouted from total depth to near surface and capped <br /> with using Portland Type I/II cement with approximately 3%bentonite powder. An approximate <br /> 2-foot-diameter area(measured from the well casing)will be excavated to allow for the grout cap.The <br /> approximate bottom of the excavation pit will be approximately 2 feet bgs,but no deeper than 4 feet <br /> bgs. The well casing will be cut to the depth of the bottom of the excavated pit. <br /> Soil removed from the excavation pit will be spread over the decommissioned well, if the soil contains <br /> less than I%of visible solid waste. If the soil contains more than I% visible solid waste,the soil and <br /> solid waste will be placed in appropriately labeled 55-gallon drums and stored on-site disposal at an <br /> appropriate off-site landfill. An SJCEHD representative will be present during well decommissioning <br /> activities. <br /> TABLE 1 <br /> Well Construction Details <br /> Borehole Casing Screen Total Borehole <br /> Diameter Casing Diameter Interval Depth <br /> inches Material (inches) feet bgs) <br /> feet b s <br /> MW-1 8 SCH 40 PVC 2 13-28 32 <br /> MW-2 8 SCH 40 PVC 2 10-25 25 <br /> MW-3 8 SCH 40 PVC 2 14-29 29 <br /> bgs = below ground surface <br /> SCH 40 PVC = Schedule 40 polyvinyl chloride <br /> Health and Safety <br /> URS will conduct a health and safety meeting with all field staff, including subcontractors,before <br /> field work begins. All field staff will be 40-hour Hazardous Waste Operations and Emergency <br /> Response(HAZWOPER)-certified. A copy of the Health and Safety Plan will be available on-site and <br /> is included as Attachment C. <br /> Report Preparation <br /> URS will submit a report summarizing field activities and providing documentation of well <br /> abandonment activities, including photographs,and the approved permit. <br /> H:\Wprocess\25532\WorldEnterprise\Well Destruction\Revised Report 12-1-11.doc <br />